Vol 2 Chapter 310: The secret hidden in the book is...

In the night, Angel continued in a weak voice, the more wrong and the more outrageous.
"Next... Go all the way and meet a pub called "Water and Fire"... Rao past and turn right, then..."
Listening to Angel’s words, Richard suddenly interrupted and asked seriously, "Do you know where you are now?"
"Ah?" Angel stared slightly, looking down at the ground. "On the ground?" Looking up at the starry sky: "Below the stars?"
"..." Richard was silent for a while, but he exhaled helplessly and said to Angel, "Okay."
"Ah?" Angel said unclearly.
"Let me take you back to Baishi High Tower College," Richard said. According to Richard now, according to Angel's degree of road blindness, even if you give directions a hundred times, you may not be able to reach it smoothly. He still sent the other party back, and it was better to take this matter a hundred times. What happened to the other party on the way back from the province caused unnecessary trouble.
Richard stepped forward, glanced at Angel, who had not responded, and said, "Why? You don't want to go back?"
"Um...no...no." Angel said quickly.
"Then keep up, keep up."
"Yeah, yes." Angel hurried to catch up and followed her step by step.
Richard and Angel, both in tandem, quickly reached the White Rock City.
When walking in Baishi City and walking to the more familiar "Salt and Fire" tavern, Richard found that the tavern was closed. But there was still a faint song floating in it, which was a piece of music he had heard before and was somewhat familiar. The meaning may not be understood, but the rhythm of the song is unchanged:
It was first a 2/4 beat of "strong and weak, strong and weak", then a 3/4 beat of "strong and weak", and then a 6/8 beat of "strong and weak, second strong and weak".
"Tap, tap, tap, tap..."
Richard listened to the tune, and took Angel to the pub to turn left and continue on...
Eventually, the singing of the "Salt and Fire" tavern disappeared, and Richard stopped at the entrance of Baishi Gaota College. Reaching forward, Richard pointed at Angel who was behind him: "At this point, you should know how to go? Shouldn't you need me to send you back to your dorm?"
"Well, no need." Angel shook her head quickly.
"That's good, go in, I'm gone."
"Er..." Angel lowered her head and walked into the college. Turning around and secretly glancing at Li Cha, he found that Li Cha had gone into the darkness and disappeared, biting his lip, with a somewhat complicated expression, walking into the depths of the college.
...
Laboratory, main laboratory.
Richard returns.
Because all the trivial matters were solved, Richard was slightly relaxed at this time, striding to the front of the laboratory table in the room, and taking out the five newly acquired Black Spirit Empire books in the iron ring of the space, he began to study.
Putting five books on the table, Richard quickly turned to the last page, scanned the numbers on the Helling Empire logo, and his eyes flickered.
The five numbers are 3, 7, 24, 27, and 29 respectively. According to the current world version of the Liquell number verification, the palindromes obtained are 33, 55, 66, 99, and 121, respectively.
The books that have been owned before are:
, Palindrome number 11;
, 22 palindromes;
, 77 palindromes;
, 99 palindromes.
In other words, out of the five newly acquired books, only one book is repeated, and four books are new:
The first new book, the legend of ghosts;
The second new book, a collection of fable stories;
The third new book is a relatively simple wizard spell book.
The fourth new book, an autobiography of a wizard, is similar, but there is no quirky content to teach male slaves.
After clarifying the books, Li Cha's eyes were brightened, and he had to say that this night was a big harvest, and the harvest was worth all that it had before.
I previously guessed that the number behind the Black Spirit Empire Book logo should be within 40, so the number of palindromes obtained through the verification process of the Leclerc number is only 11.
11!
Now I have got 8 palindrome books, but only 3 palindrome books are not available.
In this way, even if you can't unlock the secrets hidden in the books, you should be able to see the general framework.
Richard's eyes were sharp.
What is the secret hidden in the book?
He didn't know the secret yet, but he had some guesses about the way to hide the mystery.
The way the book hides the mystery should not be a cryptic text—the text can only be revealed by using special conditions such as immersion in fire. In this way, first, it cannot be stored for too long, and second, there is no connection with the numbers on the last page of the book and the palindrome numbers.
The numbers on the logo of the Black Spirit Empire and the palindrome of the Liquell number verification are some very special numbers, which should not be confusing information, but should be related to secrets.
Then...
Speaking of numbers, Richard couldn't help but think of cryptography, a very common early lookup table replacement method.
The so-called look-up table replacement method, in simple terms, is the codebook method: to transfer information, instead of the normal word composition, but to replace with some seemingly meaningless numbers.
The person who receives the information must have the corresponding password book. According to the content of the cipher book, the correct information can be obtained only after matching the numbers one by one, to prevent interception and leakage of secrets.
This method is flexible and flexible. Be careful. In order to prevent the codebook from falling into the hands of the enemy and causing heavy losses, you can periodically change the codebook. Be more careful, every time you pass information ~EbookFREE.me~ you can use different books as new codebooks.
For example, if the sender gives the message "137, 826", then it may represent the words 137 and 826 in a book.
The person who received the information checked the book. The results were different depending on the book. It might be a "success" or "failure" message, or it might be an instruction such as "attack", "retreat", or "hide". The possibility of leaking. Of course, there are still some gaps with the encryption methods developed on the modern earth based on computer technology, such as symmetric encryption DES, 3DES, AES encryption, and asymmetric encryption RSA, ellipse encryption, etc.
Having said that, what is the result of using the lookup table replacement method in the current book?
Richard first picked up the book with serial number 1 and palindrome of 11, and found the 11th word in the book and found it to be "gram".
Then pick up the book with serial number 2 and palindrome number 22, and find the 22nd word in the book, which is "fruit".
Number 3, the palindrome is 33, the 33rd word, "Li".
No. 4 books with a palindrome number of 44 are temporarily missing, omitted.
No. 5, the palindrome is 55, the 55th word, "Ancient".
Number 6, the palindrome number is 66, the 66th word, the break symbol.
No. 7, the palindrome is 77, the 77th word, "Du".
Books with serial number 8 and palindrome number of 88 are temporarily lacking, omitted.
The 9th number, the palindrome number is 99, the 99th word, "Er".
Number 10, the palindrome number is 121, the 121st word, "Mongolian".
The book with the serial number 11 and the palindrome number is 363 is temporarily lacking, omitted.
The end result is...